Windows: Remove intermediate files at end of build.

src/msvcbuild.bat

@@ -98,6 +98,8 @@ if exist luajit.exe.manifest^
   %LJMT% -manifest luajit.exe.manifest -outputresource:luajit.exe
 
 @del *.obj *.manifest minilua.exe buildvm.exe
+@del host\buildvm_arch.h
+@del lj_bcdef.h lj_ffdef.h lj_libdef.h lj_recdef.h lj_folddef.h
 @echo.
 @echo === Successfully built LuaJIT for Windows/%LJARCH% ===